My mother has been using Outlook at her office for over 5 years. When I send an email to both her and my father, she replies only to me and frequently ends with "tell your father..."
-Copy and paste
Somehow, she understands CUT and paste, but can't make the mental leap to COPY. She typically cuts, pastes it right back to where she came from, and then goes to paste it again elsewhere.
Despite all this, she used to work with a 100% text mode CLI app for requisitioning with airline tickets as a travel agent. She was an expert at esoteric commands and had a little notebook that co-workers had photocopied and bound as a reference manual. She didn't understand a thing that she was typing, but she knew which magic incantations worked and which didn't. I noticed that she was doing the equivalent of calling functions, piping data, storing variables, etc., but to her it was "I type this in, and instead of 'CITY' I write the actual city name. Oh, but if the city name has a space in it, I need to type \ before the space. But if I type a \ anywhere else, it can crash the whole computer."
That's a pro trick, I think. I consider myself a power user and I switched from copy+paste to cut+paste+paste a while ago. It gives me an extra kick of making sure the copy worked as intended.